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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Jul. 08, 2011
Registrant Name dei_EntityRegistrantName SPDR SERIES TRUST
Central Index Key dei_EntityCentralIndexKey 0001064642
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 08, 2011
Document Effective Date dei_DocumentEffectiveDate Sep. 21, 2011
Prospectus Date rr_ProspectusDate Jul. 08, 2011
SPDR(R) Barclays Capital Global Convertible Securities ETF
 
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY SPDR® Barclays Capital Global Convertible Securities ETF
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The SPDR Barclays Capital Global Convertible Securities ETF (the “Fund”) seeks to provide investment results that, before expenses, correspond generally to the price and yield performance of an index that tracks global convertible securities markets with outstanding issue sizes greater than $500 million.
FEES AND EXPENSES OF THE FUND spdrst106464_FundFeesAndExpensesAbstract  
Expense [Heading] rr_ExpenseHeading FEES AND EXPENSES OF THE FUND
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. This table and the example below do not reflect brokerage commissions you may pay on purchases and sales of the Fund’s shares.
ANNUAL FUND OPERATING EXPENSES rr_OperatingExpensesAbstract  
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment):
MANAGEMENT FEES rr_ManagementFeesOverAssets  
DISTRIBUTION AND SERVICE (12b-1) FEES rr_DistributionAndService12b1FeesOverAssets none
OTHER EXPENSES rr_OtherExpensesOverAssets   [1]
TOTAL ANNUAL FUND OPERATING EXPENSES rr_ExpensesOverAssets  
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates "Other Expenses" are based on estimated amounts for the current fiscal year.
EXAMPLE: rr_ExpenseExampleAbstract  
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated, and then sell all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
YEAR 1 rr_ExpenseExampleYear01  
YEAR 3 rr_ExpenseExampleYear03  
PORTFOLIO TURNOVER: spdrst106464_PortfolioTurnoverAltAbstract  
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance.
Strategy [Heading] rr_StrategyHeading THE FUND’S PRINCIPAL INVESTMENT STRATEGY
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

In seeking to track the performance of the Barclays Capital Global Convertible Bond >$500MM Index (the “Index”), the Fund employs a sampling strategy, which means that the Fund is not required to purchase all of the securities represented in the Index. Instead, the Fund may purchase a subset of the securities in the Index in an effort to hold a portfolio of securities with generally the same risk and return characteristics of the Index. The quantity of holdings in the Fund will be based on a number of factors, including asset size of the Fund. SSgA Funds Management, Inc. (“SSgA FM” or the “Adviser”), the investment adviser to the Fund, generally expects the Fund to hold less than the total number of securities in the Index, but reserves the right to hold as many securities as it believes necessary to achieve the Fund’s investment objective.

Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index or in securities that the Adviser has determined have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the Index. The Fund will provide shareholders with at least 60 days notice prior to any material change in this 80% investment policy. In addition, the Fund may invest in debt securities that are not included in the Index, futures, options, swap contracts and other derivatives, cash and cash equivalents or money market instruments, such as repurchase agreements and money market funds (including money market funds advised by SSgA FM), the investment adviser to the Fund. The Fund may also enter into forward currency exchange contracts for hedging and/or investment purposes.

The Index is designed to represent the market of global convertible securities, such as convertible bonds, with outstanding issue sizes greater than $500 million. Convertible bonds are bonds that can be exchanged, at the option of the holder, for a specific number of shares of the issuer’s preferred stock (“Preferred Securities”) or common stock.

The Index components are a subset of issues in the Barclays Capital Global Convertible Composite Index. To be included in the Index a security must meet the following requirements: (i) have an outstanding issue size greater than $500 million; (ii) be a non-called, non-defaulted security; (iii) have at least 31 days until maturity; and (iv) be a registered or a convertible tranche issued under Rule 144A of the Securities Act of 1933, as amended. The Index is rebalanced on a monthly basis, at the end of each month. Countries covered in the Index have historically included, among others, Abu Dhabi, Australia, Austria, Belgium, France, Germany, great Britain, Hong Kong, Hungary, India, Italy, Japan, Luxembourg, Malaysia, Norway, Portugal, Russia, Singapore, South Africa, south Korea, Spain, Sweden, Switzerland, Taiwan, and the United Stares. As of May 31, 2011, there were approximately 237 securities in the Index.

The Index is sponsored by Barclays Capital, Inc. (the “Index Provider”) which is not affiliated with the Fund or the Adviser. The Index Provider determines the composition of the Index, relative weightings of the securities in the Index and publishes information regarding the market value of the Index.

Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, the Fund generally invests substantially all, but at least 80%, of its total assets in the securities comprising the Index or in securities that the Adviser has determined have economic characteristics that are substantially identical to the economic characteristics of the securities that comprise the Index.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with all investments, there are certain risks of investing in the Fund, and you could lose money on an investment in the Fund.

PASSIVE STRATEGY/INDEX RISK: The Fund is managed with a passive investment strategy, attempting to track the performance of an unmanaged index of securities. This differs from an actively managed fund, which typically seeks to outperform a benchmark index. As a result, the Fund may hold constituent securities of the Index regardless of the current or projected performance of a specific security or a particular industry or market sector. Maintaining investments in securities regardless of market conditions or the performance of individual securities could cause the Fund’s return to be lower than if the Fund employed an active strategy.

INDEX TRACKING RISK: While the Adviser seeks to track the performance of the Index as closely as possible (i.e., achieve a high degree of correlation with the Index), the Fund’s return may not match or achieve a high degree of correlation with the return of the Index due to operating expenses, transaction costs, foreign currency-related transactions, cash flows, regulatory requirements and operational inefficiencies. For example, the Adviser anticipates that it may take several business days for additions and deletions to the Index to be reflected in the portfolio composition of the Fund.

DEBT SECURITIES INVESTING RISK: The value of the debt securities may increase or decrease as a result of the following: market fluctuations, increases in interest rates, inability of issuers to repay principal and interest or illiquidity in the debt securities markets; the risk of low rates of return due to reinvestment of securities during periods of falling interest rates or repayment by issuers with higher coupon or interest rates; and/or the risk of low income due to falling interest rates. To the extent that interest rates rise, certain underlying obligations may be paid off substantially slower than originally anticipated and the value of those securities may fall sharply. This may result in a reduction in income from debt securities income.

CONVERTIBLE SECURITIES RISK: Convertible securities tend to be subordinate to other debt securities issued by the same issuer. Also, issuers of convertible securities are often not as strong financially as issuers with higher credit ratings. Convertible securities generally provide yields higher than the underlying stocks, but generally lower than comparable non-convertible securities. Because of this higher yield, convertible securities generally sell at a price above their “conversion value,” which is the current market value of the stock to be received upon conversion. The difference between this conversion value and the price of convertible securities will vary over time depending on changes in the value of the underlying common stocks and interest rates.

PREFERRED SECURITIES RISK: There are special risks associated with investing in Preferred Securities. Generally, Preferred Security holders (such as the Fund) have no voting rights with respect to the issuing company unless certain events occur. In addition, Preferred Securities are subordinated to bonds and other debt instruments in a company’s capital structure and therefore will be subject to greater credit risk than those debt instruments. Unlike debt securities, dividend payments on a Preferred Security typically must be declared by the issuer’s board of directors. An issuer’s board of directors is generally not under any obligation to pay a dividend (even if such dividends have accrued), and may suspend payment of dividends on Preferred Securities at any time. In the event an issuer of Preferred Securities experiences economic difficulties, the issuer’s Preferred Securities may lose substantial value due to the reduced likelihood that the issuer’s board of directors will declare a dividend and the fact that the Preferred Security may be subordinated to other securities of the same issuer. There is a chance that the issuer of any of the Fund’s holdings will default (fail to make scheduled dividend payments on the Preferred Security or scheduled interest payments on other obligations of the issuer not held by the Fund).

FOREIGN SECURITIES RISK: Returns on investments in foreign securities could be more volatile than, or trail the returns on, investments in U.S. securities. Investments in securities issued by entities based outside the U.S. pose distinct risks since political and economic events unique to a country or region will affect those markets and their issuers. Further, such entities and/or their securities may also be affected by currency controls; different accounting, auditing, financial reporting, and legal standards and practices; expropriation; changes in tax policy; greater market volatility; differing securities market structures; higher transaction costs; and various administrative difficulties, such as delays in clearing and settling portfolio transactions or in receiving payment of dividends. Securities traded on foreign markets may be less liquid (harder to sell) than securities traded domestically. These risks may be heightened in connection with investments in developing or emerging countries.

EMERGING MARKETS RISK: Investment in emerging markets subjects the Fund to a greater risk of loss than investments in a developed market. This is due to, among other things, greater market volatility, lower trading volume, political and economic instability, high levels of inflation, deflation or currency devaluation, greater risk of market shut down, and more governmental limitations on foreign investment policy than those typically found in a developed market. In addition, the financial stability of issuers (including governments) in emerging market countries may be more precarious than in other countries. As a result, there will tend to be an increased risk of price volatility in the Fund’s investments in emerging market countries, which may be magnified by currency fluctuations relative to the U.S. dollar. Settlement practices for transactions in foreign markets may differ from those in U.S. markets. Such differences include delays beyond periods customary in the United States and practices, such as delivery of securities prior to receipt of payment, which increase the likelihood of a “failed settlement.” Failed settlements can result in losses to the Fund. For these and other reasons, investments in emerging markets are often considered speculative.

DERIVATIVES RISK: A derivative is a financial contract the value of which depends on, or is derived from, the value of a financial asset (such as stock, bond or currency), a physical asset (such as gold) or a market index (such as the S&P 500 Index). The Fund may invest in forward foreign currency contracts, which involve an obligation to purchase or sell a specific amount of currency at a future date or date range at a specific price, thereby fixing the exchange rate for a specified time in the future. Compared to conventional securities, derivatives can be more sensitive to changes in interest rates or to sudden fluctuations in market prices and thus the Fund’s losses may be greater if it invests in derivatives than if it invests only in conventional securities.

NON-DIVERSIFICATION RISK: The Fund is non-diversified and may invest a larger percentage of its assets in securities of a few issuers or a single issuer than that of a diversified fund. As a result, the Fund’s performance may be disproportionately impacted by the performance of relatively few securities.

Risk Lose Money [Text] rr_RiskLoseMoney As with all investments, there are certain risks of investing in the Fund, and you could lose money on an investment in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus NON-DIVERSIFICATION RISK: The Fund is non-diversified and may invest a larger percentage of its assets in securities of a few issuers or a single issuer than that of a diversified fund. As a result, the Fund’s performance may be disproportionately impacted by the performance of relatively few securities.
FUND PERFORMANCE spdrst106464_FundPastPerformanceAbstract  
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading FUND PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The Fund has not yet completed a full calendar year of investment operations and therefore does not have any performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns based on net assets and comparing the Fund’s performance to the Index.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess The Fund has not yet completed a full calendar year of investment operations and therefore does not have any performance history.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by showing the variability of the Fund’s returns based on net assets and comparing the Fund’s performance to the Index.
[1] "Other Expenses" are based on estimated amounts for the current fiscal year.